Release Agents in Tyre and Rubber Production

Release problems cost cycle time and produce cosmetic rejects. In tyre and moulded rubber production, the answer is usually a combination of an internal release aid and a correctly maintained external system rather than one product used harder.

External release

Sprayed or wiped onto the mould surface: emulsion or solution products applied every few cycles, and semi-permanent coatings applied less frequently. Their job is to fill mould micro-roughness and present a low-energy surface to the rubber.

Internal release

Compounded into the rubber: fatty acid derivatives, waxes and certain processing aids that migrate to the surface during cure. Internal release reduces dependence on spraying and helps with deep or complex cavities where spray coverage is unreliable.

What causes fouling

• •Buildup from low-molecular-weight ingredients migrating and degrading on the mould surface.
• •Over-application of external release, which bakes onto hot tooling.
• •Insufficient cure, leaving sticky low-crosslink material behind.
• •Mould surface damage, which gives deposits somewhere to anchor.

Practical approach

Reduce spraying frequency gradually while introducing an internal release aid, and clean the tooling on a fixed schedule rather than only when rejects appear. Track the number of cycles between cleanings — that number is the clearest measure of whether the release system is improving. ## Need the documents or today's price? Send us the grade, quantity and destination port — we return a quotation with COA and MSDS attached. Email manager@fipolymer.com or use the inquiry form on this site.